One Piece- the manga is the best
Magi- awesome and not childish as it may appear
Yankee-kun- to funny
Slam Dunk- Funny and a sports manga that actually works
Rurouni kenshin- epic to the emph degree
Bakuman- i dont know if it is possible not to like
Monster- will blow your mind
Gamaran- good old sword fighting manga

#1: HUNTER X HUNTER (favorite story of all-time so far)
#2: Tower Of God (Manhwa, but doesn't even matter because it's so damn good)
#3: The Breaker & The Breaker: New Waves (also Manhwa, but very very good)
#4: GANTZ
#5: NARUTO
#6: BLEACH
#7: Nurarihyon no Mago
#8: I"s (romance, but by far the best shonen romance I have ever read)
#9: Shingeki no Kyojin (also called Attack on Titan)
#10: Katekyo Hitman REBORN! (would be ranked higher if it weren't for the abrupt ending)
#11: Gintama (I think the anime is better though personally)

I just recently started to read mangas so I haven't read that much but I've read some pretty interesting ones.

1. Kimi no Iru Machi - a great manga and awesome character designs. I just finished this yesterday and I'm TOTALLY hooked. Pretty HEAVY drama (for me at least)
2. Horimiya - an interesting school couple. I'm excited to how their relationship will develop.
3. KissXSis - If you've got a thing for (imaginary) incest/taboo this is probably for you.

I've only got 3 mangas I like now and I'm still trying to find some mangas like 'KIMI NO IRU MACHI'

If it's not a bother to you you can recommend message me the title of some good ones with HEAVY DRAMA themed mangas like 'Kimi no Iru Machi'

i don't read that much manga since i'm slow at reading them. plus, i usually tend to read those that are notably different from their anime adaptations. i'm one of those people who likes two different versions of the same story. but here are some that I like. there are a couple that i haven't read yet but plan on it once i finish other series.

1 Rozen Maiden (My personal favorite. Very different from the anime and very awesome. Especially the second series)

2 Fullmetal Alchemist (its worth watching both anime as well)

3. Soul Eater (again follows a different story from the anime and still ongoing. Very intense now)

4 Arisa (great suspense. why can't it be an anime????)

5. Rosario + Vampire (I HATE the anime. Fanservice is ridiculous and the suspense was toned down. read the manga. its way better)

6. Gakuen Alice (looks can b very decieving. what started as a kid's school comedy got really dark)

7. Fairy Tail (I'm new to this series. Decided to read after watching the entire first season in less than a week)

8. Kitchen Princess (Drawn by Natsumi Ando, who did Arisa. This one is popular. I wonder if she doesn't want her work adapted)

9. Shugo Chara (two good things about it. Heroine is a non-traditional magical girl lead and no filler)

10. Pandora Hearts (This was recommended by a friend of mine. I haven't started reading yet but i will)

11. Sailor Moon (i haven't read this one either but everyone should take a look since it had little in common with its anime)

I also want to mention. It's been announced that the Rozen Maiden anime will be getting another season I'm so happy. I love the anime as well as the manga so i don't care what they plan to do with it as long as Kirakishou is in it. She's an important character and its sad that she only made a cameo in Traumend.

1.naruto
2.one piece
3.bleach
4.KATEKYO HITMAN REBORN( btw...if you havent seen this anime please watch it on CR it strts off slow because characters are being introduced but if you hold off until episode 18 the action will jump off)!!!!!
5.fairytail
6.kenichi the mightiest diciple
7.blue exorcist
8.hunter x hunter
9.the world god only knows
10.dragonball
11.suzuka

1. Rave by Hiro Mashima,
Its simply this--Once upon a time, on funky sunny island,
Only fifty years when we saw the world explode,
There lived a young lad, having fun and causing trouble,
Along came a dude who had a massive sword that glowed!
2. Fairy tail also by Hiro Mashima
It follows a user of an ancient style magic (dragonslayer) part of the most powerful guild in the land of Fiore (fairy tail DUH)
3. One piece by Eiichiro Oda
A guy who ate a evil fruit that turned him into rubber is putting together a obviously overpowered pirate crew to get the greatest treasure ever--One Piece
4. Katekyo Hitman Reborn by Akira Amano
A sad exuse for a middle schooler is suddenly approached by a baby claiming to be his tutor to become the next boss of the Vongola Mafioso Famiglia
5. Immortal Regis/Cavalier of the Abyss by Juder Deo JYU
One day a normal poverty stricken highschooler is thrown into the world of the supernatural where he fights to get back to his brother
6. Kenichi the Mightiest disciple by Syun Matsuena
Kenichis has always lived the life of the bullied and weak until one day he meets a girl who introduces him to people who will change his life forever
7. Magi by Shinobu Ohtaka
After being released from his confinement Aladdin meets Alibaba and then starts his journey to learn about his destiny
8. Kubera by Currygom
To difficult to explain in a short amount
9. The God of Highschool by Park Yong-je
This story focuses on three Highly experienced fighters from Seoul who are invited to participate in a tournment that if they win they can get any wish granted
10. Tower of God by Siu
Google it because its to intricate for me to want to explain
11. Ubel Blatt by Etorouji Shiono
Koinzell has returned after being betrayed by his comrades in the previous war and he isnt looking to make amends